Differential spectra are shown in Figs. REF ,REF ,REF  for angular distributions and the
invariant meson-nucleon and meson-meson distributions. Only a few examples are shown, the full data set will be published
in an upcoming paper.
The angle \(\theta ^{\star }_{2\pi ^0}\)  is the polar angle of
the combined two-pion system in the overall cm frame (i.e., within experimental resolution back-to-back with the recoil
nucleon). The invariant-mass distributions of the pion-nucleon system are mostly sensitive to contributing intermediate
resonances and the pion-pion invariant masses carry the signal from contributions such as \(N^{\star }\rightarrow N\sigma \) 
involving the \(f_0(500)\)  meson [1]}.
